We have run into a server issue and cannot set the attribute on the search.php script.
This effects tag search and normal search functions. The function returns a 403 Forbidden error.
This has been verified; all out links are temporally effected. No back link or anchor text associated with submissions.
The link still works fine, but the search engines cannot get past the 403: forbidden to read the attributes.
We are working hard to get the problem resolved.
UPDATE:
This has been resolved. Search function is now back to 100% efficiency